Geoff Makhubo, the executive mayor of the City of Johannesburg, is expected to testify before the judicial commission of inquiry into allegations of state capture on Friday.
Evidence leader advocate Matthew Chaskalson, told Deputy Chief Justice Raymond Zondo, who chairs the commission, that Makhubo would be testifying about donations to the ANC made by IT service management company EOH and by other companies, including Regiments Capital.
Makhubo was the treasurer-general of the ANC's greater Johannesburg region from 2008 to 2018.
"He was also MMC for finance when the City of Johannesburg concluded two IT contracts with EOH... and he will be testifying about his role in relation to those contracts," Chaskalson said on Monday.
AmaBhungane estimated that, between 2006 and 2015, Molelwane Consulting had received R30 million.
Makhubo has appeared before the ANC's Integrity Committee over allegations of impropriety involving the City of Johannesburg's Sinking Fund.
He previously said he was cleared of any wrongdoing by the ANC's integrity commission, News24 reported.